Self-consistent theory of localization and Coulomb drag effect

We study the Coulomb drag rate for electrons in a double-quantum-well struc ture in the presence of disorder. The self-consistent theory of localizatio n is used to obtain the frequency dependence of the generalized diffusion c oefficient which influences the response functions. The interplay between s creening effects and disorder at low temperature gives rise to an enhanced drag rate as the system goes from a weakly localized to a strongly localize d phase with increasing disorder. The change in the interlayer momentum tra nsfer rate may be used as a probe to investigate localization properties of coupled quantum-well systems.